INSTRUCTION MANUAL. Model Dual Input RTD Thermometer. Measures two temperatures simultaneously. Dual RTD probe inputs

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INSTRUCTION MANUAL Model 421504 Dual Input RTD Thermometer Measures two temperatures simultaneously Dual RTD probe inputs Clock and Elapsed Timer functions Special functions include Data Hold,

1 INSTRUCTION MANUAL Model Dual Input RTD Thermometer Measures two temperatures simultaneously Dual RTD probe inputs Clock and Elapsed Timer functions Special functions include Data Hold, MIN/MAX/AVG, audible HI/LO Alarms, Auto Power Off, Relative Mode and probe selection key 1. INTRODUCTION Congratulations on your purchase of Extech s RTD Thermometer. This professional meter, with proper care, will provide years of safe reliable service Ver /00

2 2. SPECIFICATIONS 2.1 General Specifications Display 5-digit LCD with "----" overload/open-input indication Power Supply 9VDC battery. Battery life 100 hours typical with carbon zinc battery (30 min. auto power off) Weight 11.73oz. (365 g) Dimensions 7.56 x 3.58 x 2" (192 x 91 x 52.5mm) Accessories Supplied 9V battery and protective holster 2.1 Electrical Specifications Display Resolution 0.2 o F or 0.1 o C Resolution RTD Probe (Pt Ω) -328 to 1472 o F (-200 to 800 o C) (European curve Alpha =.00385) RTD Probe (Pt Ω) -328 to 1166 o F (-200 to 630 o C) (U.S. curve Alpha = ) Temperature units Selectable C or F temperature units Accuracy Accuracy is specified for operating temperatures in the range of 64 to 82 o F (18 to 28 o C) for a period of one year, not including the RTD probe error ±(0.05% rdg o C) for o C Scale ±(0.05% rdg o F) for o F Scale Temperature Coefficient Multiply the applicable accuracy specification per o C from 0 to 18 o C and 28 to 50 o C (32 to 64 o F and 82 to 122 o F) by 0.1 Input Protection 24VDC or 24VAC rms max. input on any combination of inputs. NOTE: Max. Voltage between T1 and T2 during measurement = 1V Reading rate One reading per second Input connectors Accepts standard 3-terminal RTD sub-miniature connectors (flat blade, 7.9mm spacing) Ambient Operating Range 32 to 122 o F (0 to 50 o C); less than 80% RH Storage Temperature -4 to 140 o F (-20 to 60 o C); less than 70% RH Ver /00

3 3. FRONT PANEL DESCRIPTION 1- Temperature Sensor inputs 2- LCD Display 3- Keypad 4. PREPERATION FOR MEASUREMENT 4.1 International Symbols DC Voltage or Current AC Voltage or Current Ground Refer to explanation in owner s manual Dangerous voltage risk of electrical shock Double insulation Ver /00

4 5. OPERATION 5.1 Getting Started First ensure that a fresh battery is installed then plug the RTDs into the meter's RTD input terminals. 5.2 Powering the Meter Press the "Power" key to toggle the meter ON/OFF. NOTE: If the SET, RELATIVE, or MIN/MAX/AVG MODE is engaged, the meter cannot be powered down. Exit these modes before attempting to power down. 5.3 Temperature Units The Main and Second display (one for each RTD input) can each read in either C or F. Press the appropriate "C/F" key to toggle between C and F temperature units. The meter remembers the desired units of measure upon power OFF. 5.4 Data Hold Mode While the meter is measuring, pressing the "Hold" key "freezes" the MAIN DISPLAY temperature value. When selected, the "HOLD" indicator will appear on the LCD. Press "Hold" again to cancel this operation. In MIN/MAX Mode, pressing the "Hold" key cancels the data recording session (press "Hold" again to resume recording). 5.5 Main Display Input Selection "T1, T2, or T1 - T2" Pressing the "T1 T2 / T1 - T2" key (the key with the number 4 overlay) permits the user to select the RTD input configuration which will be reflected on the meter's Main Display (largest LCD digits). Choose "T1 or T2" to show either RTD input 1 or 2 respectively. Select "T1 - T2" to display the difference between the two RTD input temperatures. In T1 - T2 mode, a reading of zero indicates that both RTDs are sensing the same temperature. Use the "Pt385/3926" key to select RTD type. 5.6 "Pt385/3926" #1 Input (T1) - RTD Type Selection for the Main Display Match the Alpha RTD type (3850 or 3926) that is connected to the T1 terminal by toggling the "Pt385/3926" key. The meter remembers this selection upon power OFF. 5.7 MIN/MAX/AVG RECORD Mode (for Main Display only) To enter this mode, press the "MIN/MAX" key (the RECORD display icon will appear). Repeated key-presses cycle through Min, Max, and Avg modes each with its own LCD icon. Once this key is pressed, the meter begins recording peak, valley, and average temperatures. Each time a new peak is measured, the previous Max displayed value is replaced. The same applies to the Min function. An audible beep alerts the user that a new peak or valley has been recorded. To toggle between start/stop recording, press the HOLD key. When recording is stopped, the stored values are held in meter memory until Min/Max/Avg mode is canceled or resumed by pressing the "Hold" again. The Avg mode keeps a true running average of temperatures recorded since the "MIN/MAX" key was first pressed (up to a maximum of 22 hours). If 22 hours elapse the average stored at this point is held on the display and is no longer updated (the MIN and MAX functions continue without interruption indefinitely). If an overload is recorded, the Avg function is halted and the Avg. display shows " " Ver /00

5 NOTE: Keep in mind that the main displayed value is either the Min, Max, or Avg reading depending upon which icon appears on the LCD. Cycle through Min/Max/Avg with the "MIN/MAX" key. Each value for MIN/MAX/AVG has an associated time value (3rd display) memorized to tell the user when a peak or valley has occurred. The Min/Max/Avg mode cancels the Auto Power OFF feature, disables most of the meter keys, and will not allow a manual power OFF. Press and hold the MIN/MAX key for several seconds to cancel Min/Max/Avg mode and return to normal operation. 5.8 Relative Mode (REL) for Main Display Only The Relative Mode permits the user to store the current temperature value (or enter one manually - see Set Mode) and compare it to subsequent temperature readings. In Relative mode display indicates: Actual temp. minus Relative temp. = Displayed temperature). To enter this mode press the "REL" key; The REL icon will appear on the LCD and the temperature display shows zero (indicating that the actual temp. and relative temp. are the same). Press the REL key again to exit the REL Mode. To display the difference between the actual temperature and a manually entered Relative value, press the SET key (see SET mode below). 5.9 Real-Time/Elapsed Timer Clock The Timer (third display on bottom right of LCD) displays Clock or Elapsed Time and is a convenient way to see when Min and Max temperatures occurred. Each time new Min or Max temperature values are stored, the timer/clock value for the that Max or Min temperature is also stored for later recall. Real time can be entered by setting the meter's clock to the current time. To use the clock as an elapsed timer, first reset the clock to zero in Set Mode (see next section) SET Mode (for Relative Mode, HI/LO Alarm setpoints, and Clock/Timer settings) Manually setting the Relative Values in SET Mode Press the "SET" key once and the display will show all dashes "======". Enter the relative value using the meter's keys which double as numeric keys. Once the Relative value is entered, press the ENTER key FOUR times to return to normal operation. Now when the Relative Mode is activated, the Meter will display Actual Temperature minus Relative Temperature Setting the Timer/Clock in SET Mode Press the "SET" key and then the "ENTER" key. Next key in the Hours, Minutes, and Seconds (HH:MM:SS) via the overlay numeric keys. When editing is complete, the clock will begin counting. Press the "ENTER" key three times to return to normal meter operation Alarm HI/LO Limit Programming in SET Mode Press the "SET" key once and then the "ENTER" key twice. Key in the desired HI Alarm value (high temperature at which the meter will audibly alert the user) via the overlay numeric keys. Now press the "ENTER" key once. Next, key in the LO Alarm Limit value (low temperature at which the meter audibly alerts the user). Press the ENTER key once to return to normal operation and the alarms will be armed giving an audible alert when a limit is reached Ver /00

6 5.11 Second Display Input Selection "T1, T2 or T1-T2" Pressing the "T1 T2 / T1 - T2" key (the key with the minus sign printed over it) permits the user to select the RTD input configuration which will be reflected on the meter's Second Display (lower left LCD). Choose "T1 or T2" to show either RTD input 1 or 2 respectively. Select "T1 - T2" to display the difference between the two RTD input temperatures. In T1 - T2 mode, a reading of zero indicates that both RTDs are reading the same temperature "Pt385/3926" RTD #2 Input (T2) - RTD Type Selection for the Second Display For the type of RTD that is plugged into the T2 terminal on the meter, select "385 or 3926" (to match input) by toggling the "Pt385/3926" key. The meter remembers this selection upon power OFF HI/LO Alarm Limits Key When the actual temperature meets or exceeds the user programmed temperature limits a continuous alert tone will be heard. Press the "HI/LO Limits" key to silence the alarm when it audibly trips. 6. MAINTENANCE 6.1 Battery Replacement Open the rear battery compartment and replace the spent battery with a fresh 9V battery. Secure the battery compartment cover. Do not leave battery in meter if meter is not to be used for long periods. 6.2 Cleaning Caution: Use only a dry cloth to clean the plastic case. 7. CALIBRATION / REPAIR SERVICES Extech offers complete repair and calibration services for all of the products we sell. For periodic calibration, NIST certification or repair of any Extech product, call customer service for details on services available. Extech recommends that calibration be performed on an annual basis to insure calibration integrity. 8. WARRANTY EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies on sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) ext. 210 for authorization. A Return Authorization (RA) number must be issued before any product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or implied. Copyright 1999 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form. Tech Support Hotlines ext. 200 extech@extech.com Ver /00

User's Guide. Dual Input RTD Thermometer. Model Washington Street Melrose, MA Fax TestEquipmentDepot.

User's Guide. Dual Input RTD Thermometer. Model Washington Street Melrose, MA Fax TestEquipmentDepot. User's Guide 99 Washington Street Melrose, MA 02176 Fax 781-665-0780 TestEquipmentDepot.com Dual Input RTD Thermometer Model 421504 Specifications General Specifications Display 5-digit LCD with overload/open-input